Description

The 6DD1683-0CD5​ is Siemens’ SIMADYN D SP23.5 power supply unit, the AC-input, fan-cooled member of the SP2x family that lives in the dedicated PSU slot of a SIMADYN D 19″ drive cabinet. Delivering 5 V / 25 A​ for the PM4/PM5/PM6 CPU logic rail and 15 V​ for the analog front-end (IT41/IT42 A/D references, SE20 COM boards), the 6DD1683-0CD5​ accepts a universal 115/230 V AC​ mains feed and internally regulates the two rails that the entire local-bus subsystem (CPU + up to 2 ITxx submodules + SExx comms) draws from. At ~125 W pure dissipation on the 5 V rail alone, the SP23.5 suffix “.5” denotes the built-in forced-air fan — distinguishing it from the fanless SP23 (6DD1683-0CD0, 24 V DC input) and SP22 (6DD1683-0CC5, also 24 V DC input) variants in the same mechanical envelope.Siemens marked the 6DD1683-0CD5​ PM500 “Product deleted without replacement” effective October 1, 2017, meaning there is no Siemens-official successor with the same 19″ SIMADYN D form factor and 5 V/25 A + 15 V rails — plants still running SIMADYN D (hot-strip AGC, cement-mill cycloconverters, marine propulsion, rolling-mill main drives) live on tested-refurb rotation.

Application Scenarios

On a 1450 mm hot-strip finishing-train drive cabinet in a Central European integrated mill, the SIMADYN D rack still owns the F1–F7 main-motor vector loops because the SINAMICS DCM / S120 + TDC migration was quoted at a 14-day outage the mill couldn’t give. That rack’s PSU slot has carried a 6DD1683-0CD5​ SP23.5 for 21 years — 115 V AC mains feeds the SP23.5, which pushes 5 V / ~18 A steady-state to the PM6 CPU + one IT41 + one IT42 (6DD1606-4AB0 from the previous description) + one SE20.2, while the 15 V rail feeds the IT42’s A/D reference chain and the SE20’s fiber transceivers. The 5 V rail ripple matters here — the PM6’s local-bus timing to the IT42’s V/F counters is sensitive to >50 mV p-p, and the SP23.5’s regulated 5 V holds <30 mV across load steps. When the 6DD1683-0CD5‘s fan bearing started rattling at year 19 (the 5 V/25 A section was still clean — the fan is the first thing to go on SP23.5 because it’s the only moving part), maintenance swapped a refurb unit in during a coil-changeover lunch break — 115 V AC disconnect, unbolt the SP23.5 from the 19″ rail, slide the new 6DD1683-0CD5​ in, reconnect the 5 V/15 V busbars to the PM baseboard’s power header, done. Downtime: 22 minutes. The alternative — rip the whole SIMADYN D rack for TDC/S7-1500 + S120 — was a 10-day outage plus €200 k+ engineering. That’s why the 6DD1683-0CD5​ still moves as a spare SKU 8+ years past its deletion date.

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